Table 1

Case definition of patients with snakebite envenoming

No envenomingPatients with no local or systemic signs or symptoms
Mild envenomingLocal oedema in one or two segments, pain at the bite site, absence of systemic signs or symptoms.
Moderate envenomingOedema in three segments, local haemorrhage. Systemic symptoms (bleeding, hypotension) and blood clotting test alterations
Severe envenomingOedema extending to the whole limb, local haemorrhage with necrosis, severe hypotension, blood clotting alterations, systemic bleeding and, in some cases, acute kidney injury.